Observatoire de Paris / LERMA
Observatoire de Paris / LERMA

Laboratoire de Radioastronomie ENS - LERMA UMR 8112

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Sommaire

Pierre Lesaffre

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Pierre Lesaffre

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Summary

Research interests

I'm interested in various fields of computational astrophysics, which share in common the problem of coupling chemistry and hydrodynamics :

  • Star formation,

  • ISM dynamics and chemistry,

  • MHD shocks,

  • Type Ia Supernovae,

  • MHD in accretion disks.

Codes

Shock

A moving grid implicit 1D MHD code with fully coupled chemical network. This is still private property of CEA, so I should ask the permission before it is made available here... (associated paper)

Collapse

Same as above, but in spherical geometry and with radiative transfer on grains. Aimed at computing the pre-stellar and proto-stellar phases of star formation with chemistry coupled. (associated paper)

Front

An extension of Shock with diffusion. Aimed at describing the edge of molecular clouds. (associated paper)

Flash_the_tortoise

A stellar evolution code designed to describe flashing events during stellar evolution. download flash.tar (associated paper)

Zeus3d+

Improvement on the Zeus version I got from S. Fromang (conservative, shear waves OK). See the link on the magnet page.

Shooting_star

My current project... an other attempt at solving numerically for the convective Urca process !

Main Publications

Accretion disks

  • "Exact shearing box solutions of magnetohydrodynamic flows with resistivity, viscosity and cooling" paper

Stellar evolution

  • "The C flash and the ignition conditions of Type Ia supernovae" paper

  • "A two-stream formalism for the convective Urca process" paper

  • "A convective model consistent with chemistry" paper

MHD shocks

  • "Time-dependent analytic solutions of quasi-steady shocks with cooling" paper

  • "Effects of turbulent diffusion on the chemistry of diffuse clouds" paper

  • "The dynamical influence of cooling in the envelope of prestellar and protostellar cores" paper

  • "Temporal evolution of magnetic molecular shocks II. Analytics of the steady state and semi-analytical construction of intermediate ages" paper

  • "Temporal evolution of magnetic molecular shocks I. Moving grid simulations" paper

Few useful links

Various pdf presentations

Link to Presentations